Fanuc Corporation

Fujitsu Fanuc Limited

Yoichi Amemiya

Masatoyo Sogabe

Shigeki Kawada

Noboru Iwamatsu

Ryoichiro Nozawa

Yoshinori Kohzai

Yoshinori Kozai

Hideaki Kawamura

Takao Sasaki

Yoshiki Fujioka

Hiroshi Ishida

Hidetsugu Komiya

Shigeyuki Ushiyama

Kiyoshi Tagami

Yo Ikebe

Mitsuo Kawamata

Jun Ikebe

Sunao Asahara

Kazushi Kumagai

Yashitaka Takekoshi

Katsuya Sugahara

Shigeru Isohata

Yoshitaka Takekoshi

In an AC servomotor constructed so that the outer circumference (21b) of a stator core (21) formed by laminating thin steel plates (22) is used as part of a motor housing, bearing mounting bores (25a, 26a) for receiving bearing members (27, 28) to be mounted on a pair of brackets (25, 26) attached to the front and rear ends of the stator core (21) and mounting surfaces (25b, 25c) of the motor are formed with accurate concentricity and squareness with reference to the center bore (21a) and the outer circumference (21b) of the stator core (21) after firmly joining the brackets (25, 26) to the stator core (21). Thus, a rotor (29) is supported with high accuracy in concentricity with the stator core (21) on the brackets (25, 26) and the squareness of the output shaft (29a) to the mounting surfaces (25b, 25c) is established.

AC servomotor and a method of manufacturing the same

A rotor for a synchronous motor, having a plurality of first magnetic poles formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke fixed to a rotatable motor shaft, and a second magnetic pole projecting radially from the yoke adjacently to each first magnetic pole and the second magnetic pole wherein the shape of the pole face of each first magnetic poles are in a circular arc and the shape of the pole face of each of second magnetic pole is determined by a given equation so that the magnetic flux distribution established by a pair of the first magnetic pole and the second magnetic pole is substantially equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator.

Rotor for a synchronous motor

Permanent-magnet field synchronous motor

Synchronous machine

Permanent-magnet rotor shrink-fit assembly

Shaft for an electric motor with DC brake

A permanent-magnet field rotor (10) includes a plurality of permanent magnets (18) disposed in a radial fashion, and yokes (19) disposed between each two successive permanent magnets (18) and made of a lot of sheet elements (20). The method of manufacturing the permanent-magnet field rotor comprises the step of stacking a lot of same shaped thin plate members (25) each having a plurality of sectoral york element portions (26) arranged in a radial fashion and link portions (27) each linking the outer circumferential edges of each two successive york element portions (26) to one another so as to define therebetween a permanent magnet receiving slot (29). In the state where permanent magnets (18) are inserted in the slots (29) of the stacked thin plate members (25), respectively, the stacked thin plate members (25) are firmly fixed to each other. Each of the link portions (27) of the stacked thin plate members (25) is cut out in the stacking direction by a range which is less than the width of each permanent magnet (18). From this, the yokes (19) made of sheet elements (20) are formed at the opposite sides of each permanent magnet (18) and separated from one another.

Method of manufacturing a permanent-magnet field rotor

There is disclosed a system for controlling a plurality of motors including a spindle motor of a machine tool to rotate synchronously at command speeds. The system comprises a numerical control unit for generating as positional commands trains of distributed pulses having frequencies corresponding to commanded speeds of rotation respectively for the motors, positional control feedback circuits respectively for the motors for producing speed command outputs from the trains of distributed pulses and detected signals indicative of positions of the motors, and speed control feedback circuits respectively for the motors for controlling the speed of the motors based on the speed command outputs and detected signals indicative of speeds of rotation of the motors.

System for controlling motors for synchronous operation

Synchronous rotary machine

A pulse coder comprises a rotating member (1) on which first and second magnetic patterns (221, 222; 221', 222') are formed and a fixed member (3) on which first and second magnetoresistance patterns (MR5, MR6) are formed. When the first and second magnetic patterns of the rotating member directly face the first and second magnetoresistance patterns, respectively, of the fixed member, the first and second magnetoresistance patterns have a minimum resistance value and a maximum resistance value, respectively. The first and second magnetic patterns are constructed by alternately and irregularly arranging strong magnetic field generating areas and weak magnetic field generating areas.

Pulse coder using magnetoresistance elements having an improved z-phase

A rotor structure comprising a shaft and a magnetic pole assembly comprising radially disposed permanent magnets and yokes. The magnetic pole assembly is supported by the shaft through end plates. The end plate has a recess to receive the end of the magnetic pole assembly. The magnetic pole assembly can be fit into the end plates.

Permanant magnet field type rotor structure for an electric machine

Stator of motor

Photoelectric converter-type pulse encoder

Non-contacting, speed-detecting device of a direct-current generator type

Growing community of inventors

Hachioji, Japan

Yoichi Amemiya